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Derailers: Difference between revisions

From Bike Collectives Wiki

Revision as of 03:57, 21 March 2010

This article is about the component. For the bike co-op, see Derailer Bicycle Collective. Derailers are devices that move the chain from one gear to another like a train being derailed onto a different track.

Spanish

Desviadores (m)

References

Sheldon Brown's Derailer, Not Derailleur!

Bicycle Parts
Ball Bearings • Brakes (Caliper Brakes, Cantilever Brakes & Disc Brakes) • Brake Levers • Chainrings • Chains • Cranks
Derailers (Front & Rear) • Forks • Frame • Front Derailers • Handlebars • Hubs • Pedals • Quick Release
Rim • Seatposts • Seats • Shifters • Skewer • Spokes • Stems • Tires • Tubes • Wheels

Retrieved from "https://wiki2.bikelover.org/wiki/index.php?title=Derailers&oldid=7500"

Category:

Bicycle Parts

Debug data:

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[DBReplication] Wikimedia\Rdbms\ChronologyProtector::applySessionReplicationPosition: DEFAULT (database_staging) has no position
[DBConnection] Wikimedia\Rdbms\LoadBalancer::lazyLoadReplicationPositions: executed chronology callback.
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: opened new connection for local/0
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[SQLBagOStuff] MainObjectStash using store ReplicatedBagOStuff
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
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[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds [0s] database_staging: SELECT rev_id,rev_page,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_actor,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `mw_revision` JOIN `mw_revision_comment_temp` `temp_rev_comment` ON ((temp_rev_comment.revcomment_rev = rev_id)) JOIN `mw_comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = temp_rev_comment.revcomment_comment_id)) JOIN `mw_actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `mw_page` ON ((page_id = rev_page)) LEFT JOIN `mw_user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) WHERE rev_id = 9157 LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
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[ContentHandler] Registered handler for wikitext: WikitextContentHandler
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
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Article::view: showing diff page
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
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[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
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[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::getRelativeRevision [0.001s] database_staging: SELECT rev_id FROM `mw_revision` IGNORE INDEX (rev_timestamp) WHERE rev_page = 2358 AND (rev_timestamp < '20100321035755' OR (rev_timestamp = '20100321035755' AND rev_id < 7500 )) ORDER BY rev_timestamp DESC,rev_id DESC LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds [0.001s] database_staging: SELECT rev_id,rev_page,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_actor,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `mw_revision` JOIN `mw_revision_comment_temp` `temp_rev_comment` ON ((temp_rev_comment.revcomment_rev = rev_id)) JOIN `mw_comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = temp_rev_comment.revcomment_comment_id)) JOIN `mw_actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `mw_page` ON ((page_id = rev_page)) LEFT JOIN `mw_user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) WHERE rev_id = 7499 LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds [0s] database_staging: SELECT rev_id,rev_page,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_actor,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `mw_revision` JOIN `mw_revision_comment_temp` `temp_rev_comment` ON ((temp_rev_comment.revcomment_rev = rev_id)) JOIN `mw_comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = temp_rev_comment.revcomment_comment_id)) JOIN `mw_actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `mw_page` ON ((page_id = rev_page)) LEFT JOIN `mw_user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) WHERE rev_id = 7500 LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds [0s] database_staging: SELECT rev_id,rev_page,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_actor,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `mw_revision` JOIN `mw_revision_comment_temp` `temp_rev_comment` ON ((temp_rev_comment.revcomment_rev = rev_id)) JOIN `mw_comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = temp_rev_comment.revcomment_comment_id)) JOIN `mw_actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `mw_page` ON ((page_id = rev_page)) LEFT JOIN `mw_user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) WHERE rev_id = 7499 LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] DifferenceEngine::loadRevisionData [0s] database_staging: SELECT ct_tag_id AS `value` FROM `mw_change_tag` WHERE ct_rev_id = 7499
[DBQuery] DifferenceEngine::loadRevisionData [0.001s] database_staging: SELECT ct_tag_id AS `value` FROM `mw_change_tag` WHERE ct_rev_id = 7500
[MessageCache] MessageCache using store APCUBagOStuff
[MessageCache] MessageCache::loadUnguarded: Loading en... got from local cache
ParserFactory: using default preprocessor
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::getRelativeRevision [0.001s] database_staging: SELECT rev_id FROM `mw_revision` IGNORE INDEX (rev_timestamp) WHERE rev_page = 2358 AND (rev_timestamp < '20100321035359' OR (rev_timestamp = '20100321035359' AND rev_id < 7499 )) ORDER BY rev_timestamp DESC,rev_id DESC LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds [0.001s] database_staging: SELECT rev_id,rev_page,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_actor,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `mw_revision` JOIN `mw_revision_comment_temp` `temp_rev_comment` ON ((temp_rev_comment.revcomment_rev = rev_id)) JOIN `mw_comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = temp_rev_comment.revcomment_comment_id)) JOIN `mw_actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `mw_page` ON ((page_id = rev_page)) LEFT JOIN `mw_user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) WHERE rev_id = 7054 LIMIT 1
Unstubbing $wgLang on call of $wgLang::getDatePreferenceMigrationMap from Language->internalUserTimeAndDate
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Page\PageStore::getPageByNameViaLinkCache [0s] database_staging: SELECT page_id,page_namespace,page_title,page_is_redirect,page_is_new,page_touched,page_links_updated,page_latest,page_len,page_content_model FROM `mw_page` WHERE page_namespace = 3 AND page_title = '24.9.162.101' LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::loadSlotRecordsFromDb [0s] database_staging: SELECT slot_revision_id,slot_content_id,slot_origin,slot_role_id,content_size,content_sha1,content_address,content_model FROM `mw_slots` JOIN `mw_content` ON ((slot_content_id = content_id)) WHERE slot_revision_id = 7500
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::loadSlotRecordsFromDb [0.001s] database_staging: SELECT slot_revision_id,slot_content_id,slot_origin,slot_role_id,content_size,content_sha1,content_address,content_model FROM `mw_slots` JOIN `mw_content` ON ((slot_content_id = content_id)) WHERE slot_revision_id = 7499
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Storage\SqlBlobStore::fetchBlobs [0s] database_staging: SELECT old_id,old_text,old_flags FROM `mw_text` WHERE old_id = 7425
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Storage\SqlBlobStore::fetchBlobs [0.001s] database_staging: SELECT old_id,old_text,old_flags FROM `mw_text` WHERE old_id = 7426
DifferenceEngine old '0' new '0' rcid '0'
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::getRevisionIdsBetween [0.001s] database_staging: SELECT rev_id AS `value` FROM `mw_revision` WHERE rev_page = 2358 AND ((rev_deleted & 1) = 0) AND ((rev_timestamp = '20100321035359' AND rev_id > 7499) OR rev_timestamp > '20100321035359') AND ((rev_timestamp = '20100321035755' AND rev_id < 7500) OR rev_timestamp < '20100321035755') LIMIT 1001
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds [0.001s] database_staging: SELECT rev_id,rev_page,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_actor,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `mw_revision` JOIN `mw_revision_comment_temp` `temp_rev_comment` ON ((temp_rev_comment.revcomment_rev = rev_id)) JOIN `mw_comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = temp_rev_comment.revcomment_comment_id)) JOIN `mw_actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `mw_page` ON ((page_id = rev_page)) LEFT JOIN `mw_user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) WHERE page_namespace = 0 AND page_title = 'Derailers' AND rev_id = 7500 LIMIT 1
[ParserCache] Creating ParserCache instance for pcache
[ParserCache] Creating RevisionOutputCache instance for rcache
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::loadSlotRecordsFromDb [0s] database_staging: SELECT slot_revision_id,slot_content_id,slot_origin,slot_role_id,content_size,content_sha1,content_address,content_model FROM `mw_slots` JOIN `mw_content` ON ((slot_content_id = content_id)) WHERE slot_revision_id = 7500
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Page\PageStore::getPageByNameViaLinkCache [0s] database_staging: SELECT page_id,page_namespace,page_title,page_is_redirect,page_is_new,page_touched,page_links_updated,page_latest,page_len,page_content_model FROM `mw_page` WHERE page_namespace = 10 AND page_title = 'Parts' LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds [0s] database_staging: SELECT rev_id,rev_page,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_actor,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `mw_revision` JOIN `mw_revision_comment_temp` `temp_rev_comment` ON ((temp_rev_comment.revcomment_rev = rev_id)) JOIN `mw_comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = temp_rev_comment.revcomment_comment_id)) JOIN `mw_actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `mw_page` ON ((page_id = rev_page)) LEFT JOIN `mw_user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) WHERE rev_id = 45330 LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::loadSlotRecordsFromDb [0s] database_staging: SELECT slot_revision_id,slot_content_id,slot_origin,slot_role_id,content_size,content_sha1,content_address,content_model FROM `mw_slots` JOIN `mw_content` ON ((slot_content_id = content_id)) WHERE slot_revision_id = 45330
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Storage\SqlBlobStore::fetchBlobs [0s] database_staging: SELECT old_id,old_text,old_flags FROM `mw_text` WHERE old_id = 45087
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] LocalFile::loadFromDB [0s] database_staging: SELECT img_name,img_size,img_width,img_height,img_metadata,img_bits,img_media_type,img_major_mime,img_minor_mime,img_timestamp,img_sha1,img_actor,image_actor.actor_user AS `img_user`,image_actor.actor_name AS `img_user_text`,comment_img_description.comment_text AS `img_description_text`,comment_img_description.comment_data AS `img_description_data`,comment_img_description.comment_id AS `img_description_cid`,img_metadata FROM `mw_image` JOIN `mw_actor` `image_actor` ON ((actor_id=img_actor)) JOIN `mw_comment` `comment_img_description` ON ((comment_img_description.comment_id = img_description_id)) WHERE img_name = 'Fder.jpg' LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
File::transform: Doing stat for mwstore://local-backend/local-thumb/f/ff/Fder.jpg/300px-Fder.jpg
TransformationalImageHandler::doTransform: creating 300x271 thumbnail at mwstore://local-backend/local-thumb/f/ff/Fder.jpg/300px-Fder.jpg using scaler im
TransformationalImageHandler::doTransform: Transforming later per flags.
File::transform: Doing stat for mwstore://local-backend/local-thumb/f/ff/Fder.jpg/450px-Fder.jpg
TransformationalImageHandler::doTransform: creating 450x406 thumbnail at mwstore://local-backend/local-thumb/f/ff/Fder.jpg/450px-Fder.jpg using scaler im
TransformationalImageHandler::doTransform: Transforming later per flags.
File::transform: Doing stat for mwstore://local-backend/local-thumb/f/ff/Fder.jpg/600px-Fder.jpg
TransformationalImageHandler::doTransform: creating 600x542 thumbnail at mwstore://local-backend/local-thumb/f/ff/Fder.jpg/600px-Fder.jpg using scaler im
TransformationalImageHandler::doTransform: Transforming later per flags.
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] LocalFile::loadFromDB [0s] database_staging: SELECT img_name,img_size,img_width,img_height,img_metadata,img_bits,img_media_type,img_major_mime,img_minor_mime,img_timestamp,img_sha1,img_actor,image_actor.actor_user AS `img_user`,image_actor.actor_name AS `img_user_text`,comment_img_description.comment_text AS `img_description_text`,comment_img_description.comment_data AS `img_description_data`,comment_img_description.comment_id AS `img_description_cid`,img_metadata FROM `mw_image` JOIN `mw_actor` `image_actor` ON ((actor_id=img_actor)) JOIN `mw_comment` `comment_img_description` ON ((comment_img_description.comment_id = img_description_id)) WHERE img_name = 'Rderfront.jpg' LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
File::transform: Doing stat for mwstore://local-backend/local-thumb/2/2d/Rderfront.jpg/300px-Rderfront.jpg
TransformationalImageHandler::doTransform: creating 300x340 thumbnail at mwstore://local-backend/local-thumb/2/2d/Rderfront.jpg/300px-Rderfront.jpg using scaler im
TransformationalImageHandler::doTransform: Transforming later per flags.
File::transform: Doing stat for mwstore://local-backend/local-thumb/2/2d/Rderfront.jpg/450px-Rderfront.jpg
TransformationalImageHandler::doTransform: creating 450x510 thumbnail at mwstore://local-backend/local-thumb/2/2d/Rderfront.jpg/450px-Rderfront.jpg using scaler im
TransformationalImageHandler::doTransform: Transforming later per flags.
File::transform: Doing stat for mwstore://local-backend/local-thumb/2/2d/Rderfront.jpg/600px-Rderfront.jpg
TransformationalImageHandler::doTransform: creating 600x681 thumbnail at mwstore://local-backend/local-thumb/2/2d/Rderfront.jpg/600px-Rderfront.jpg using scaler im
TransformationalImageHandler::doTransform: Transforming later per flags.
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] LinkHolderArray::replaceInternal [0.001s] database_staging: SELECT page_id,page_namespace,page_title,page_is_redirect,page_is_new,page_latest,page_touched,page_len,page_content_model FROM `mw_page` WHERE ((page_namespace = 0 AND page_title IN ('Derailer_Bicycle_Collective','Front_Derailers','Rear_Derailers','Ball_Bearings','Brakes','Caliper_Brakes','Cantilever_Brakes','Disc_Brakes','Brake_Levers','Chainrings','Chains','Cranks','Forks','Frame','Handlebars','Hubs','Pedals','Quick_Release','Rim','Seatposts','Seats','Shifters','Skewer','Spokes','Stems','Tires','Tubes','Wheels') ))
ContextSource::getContext (MediaWiki\Skins\Vector\SkinVector22): called and $context is null. Using RequestContext::getMain()
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] OutputPage::addCategoryLinksToLBAndGetResult [0s] database_staging: SELECT page_id,page_namespace,page_title,page_is_redirect,page_is_new,page_latest,page_touched,page_len,page_content_model,pp_value FROM `mw_page` LEFT JOIN `mw_page_props` ON (pp_propname = 'hiddencat' AND (pp_page = page_id)) WHERE ((page_namespace = 14 AND page_title = 'Bicycle_Parts'))
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds [0s] database_staging: SELECT rev_id,rev_page,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_actor,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `mw_revision` JOIN `mw_revision_comment_temp` `temp_rev_comment` ON ((temp_rev_comment.revcomment_rev = rev_id)) JOIN `mw_comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = temp_rev_comment.revcomment_comment_id)) JOIN `mw_actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `mw_page` ON ((page_id = rev_page)) LEFT JOIN `mw_user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) WHERE rev_id = 7500 LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::getRelativeRevision [0s] database_staging: SELECT rev_id FROM `mw_revision` IGNORE INDEX (rev_timestamp) WHERE rev_page = 2358 AND (rev_timestamp < '20100321035755' OR (rev_timestamp = '20100321035755' AND rev_id < 7500 )) ORDER BY rev_timestamp DESC,rev_id DESC LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds [0s] database_staging: SELECT rev_id,rev_page,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_actor,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `mw_revision` JOIN `mw_revision_comment_temp` `temp_rev_comment` ON ((temp_rev_comment.revcomment_rev = rev_id)) JOIN `mw_comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = temp_rev_comment.revcomment_comment_id)) JOIN `mw_actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `mw_page` ON ((page_id = rev_page)) LEFT JOIN `mw_user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) WHERE rev_id = 7499 LIMIT 1
[DBQuery] MediaWiki::preOutputCommit [0s] database_staging: COMMIT
MediaWiki::preOutputCommit: primary transaction round committed
[DeferredUpdates] DeferredUpdates::run: started MWCallableUpdate_WikiPage->doViewUpdates #870
[DeferredUpdates] DeferredUpdates::run: ended MWCallableUpdate_WikiPage->doViewUpdates #870, processing time: 7.5101852416992E-5
MediaWiki::preOutputCommit: pre-send deferred updates completed
MediaWiki::preOutputCommit: session changes committed
[DBReplication] Wikimedia\Rdbms\ChronologyProtector::persistSessionReplicationPositions: no primary positions/timestamps to save
[DBReplication] Wikimedia\Rdbms\LBFactory::shutdown: finished ChronologyProtector shutdown
[DBReplication] LBFactory shutdown completed
OutputPage::haveCacheVaryCookies: no cache-varying cookies found
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] Wikimedia\Rdbms\Database::beginIfImplied (LinkBatch::doQuery (for Skin::preloadExistence)) [0s] database_staging: BEGIN
[DBQuery] LinkBatch::doQuery (for Skin::preloadExistence) [0s] database_staging: SELECT page_id,page_namespace,page_title,page_is_redirect,page_is_new,page_latest,page_touched,page_len,page_content_model FROM `mw_page` WHERE (page_namespace = 1 AND page_title = 'Derailers')
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\User\TalkPageNotificationManager::dbCheckNewUserMessages [0s] database_staging: SELECT user_ip FROM `mw_user_newtalk` WHERE user_ip = '172.18.0.2' LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Permissions\RestrictionStore::loadRestrictions [0s] database_staging: SELECT pr_type,pr_expiry,pr_level,pr_cascade FROM `mw_page_restrictions` WHERE pr_page = 2358
[gitinfo] Candidate cacheFile=/var/www/html/w/gitinfo.json for /var/www/html/w
[gitinfo] Cache incomplete for /var/www/html/w

@@ Line 1: / Line 1: @@
-{{otheruses4|derailleurs|the co-op|Derailer Bicycle Collective}}
+''This article is about the component. For the bike co-op, see [[Derailer Bicycle Collective]].''
-'''Derailers''' are devices that move the chain from one gear to another like a train being derailed onto a different track.  [[Image:train_track_switch.jpg|thumb|right|Train track switch used to derail trains.]]
+'''Derailers''' are devices that move the chain from one gear to another like a train being derailed onto a different track.
 == See Also ==